'''
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9.
The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.
'''
print("Total sum is:", sum(filter(lambda i: (i % 3 ==0 or i % 5 == 0), range(1000))))

